[fix #706] Fixed CSV parsing issue when first cell is empty

Config: header: true, Node JS stream

Sample CSV

title,name
test title 01,test name 01
,test name 02

papaparse.js

@@ -1259,7 +1259,7 @@ License: MIT
 			}
 
 			var incrementBy = 1;
-			if (!_results.data[0] || Array.isArray(_results.data[0]))
+			if (!_results.data.length || Array.isArray(_results.data[0]))
 			{
 				_results.data = _results.data.map(processRow);
 				incrementBy = _results.data.length;

tests/node-tests.js

@@ -132,32 +132,16 @@ describe('PapaParse', function() {
 		});
 	});
 
-	it('piped streaming CSV should be correctly parsed', function(done) {
+	it('piped streaming CSV should be correctly parsed when header is true', function(done) {
 		var data = [];
-		var readStream = fs.createReadStream(__dirname + '/long-sample.csv', 'utf8');
+		var readStream = fs.createReadStream(__dirname + '/sample-header.csv', 'utf8');
-		var csvStream = readStream.pipe(Papa.parse(Papa.NODE_STREAM_INPUT));
+		var csvStream = readStream.pipe(Papa.parse(Papa.NODE_STREAM_INPUT, {header: true}));
 		csvStream.on('data', function(item) {
 			data.push(item);
 		});
 		csvStream.on('end', function() {
-			assert.deepEqual(data[0], [
+			assert.deepEqual(data[0], { title: 'test title 01', name: 'test name 01' });
-				'Grant',
+			assert.deepEqual(data[1],  { title: '', name: 'test name 02' });
-				'Dyer',
-				'Donec.elementum@orciluctuset.example',
-				'2013-11-23T02:30:31-08:00',
-				'2014-05-31T01:06:56-07:00',
-				'Magna Ut Associates',
-				'ljenkins'
-			]);
-			assert.deepEqual(data[7], [
-				'Talon',
-				'Salinas',
-				'posuere.vulputate.lacus@Donecsollicitudin.example',
-				'2015-01-31T09:19:02-08:00',
-				'2014-12-17T04:59:18-08:00',
-				'Aliquam Iaculis Incorporate',
-				'Phasellus@Quisquetincidunt.example'
-			]);
 			done();
 		});
 	});

tests/sample-header.csv

@@ -0,0 +1,3 @@
+title,name
+test title 01,test name 01
+,test name 02